Tamiya 69911 Single Gearbox 4-Speed Clear STEM Module  [69911]

Overview of the Tamiya 69911 Single Gearbox

The Tamiya 69911 Single Gearbox is intended for hands-on STEM tasks and hobby projects, providing a clear enclosure so users can observe internal motion. It is useful for demonstrating gear trains and basic mechanical advantage.

Build quality and ratio options

Constructed with a sturdy ABS resin case, the gearbox resists everyday use while allowing internal visibility. The four available gear ratios are 12.7:1, 38.2:1, 114.7:1, and 344.2:1, enabling straightforward comparisons of speed versus torque in small builds.

Included components and kit linkage

Included in the package is a Type 130 motor and both left and right 3mm hex output shafts to suit various layouts. The unit integrates with many Tamiya construction kits, making it a practical addition for educators and modelmakers.